There's mention of 'tuple' in the .tmLanguage file, but it doesn't seem to catch anything. So I might struggle to get it to capture any remaining un-scoped braces ( ). [I know there's some clever regex around the interweb which can pair-up nested brackets. Added: but you know this already!]

Still, I might give it a go

"I'm here to save your life. But if I'm going to do that, I'll need total uninanonynymity." Me Myself & Irene.